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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ef6c692ac19c307ec26dbc2b651bf73732ae61e17b6a38431afcd4a78acaa8' 
  AND token = 'RmIdaYaXv+nCJ2CApCLCdROeh6Eecj7HpUW570a3j/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}