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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e377e6408ce4688f61ba9122c7d1d3b1c3fa8ce31e1c5e8a6ece7e4b9185bb28' 
  AND token = 'fEcaUxnnif4kmcrKJqKWAntuxn+Hb2rNjA3aDfftmlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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