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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70779dadecc92bb7c7cbe4f473f9b0992853f6866393c15fbfe391587ec28c26' 
  AND token = '27Uq78xXZqjU0/OiqEK2Tx6SHUliqAefjCdiesOPKCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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