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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e4cf9a3f30f26ce69f983eef497465e5040de05db4bd461a973c60eb753c678' 
  AND token = 'u4PKkqlmWp3wHmdC7HCu4ggJVDRocB2hdI2kbsWon6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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