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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb53ac7f3ebf3363acabd7bd4114a6795e733b377c998463e5c0f867db56a98e' 
  AND token = 'ynFNg5KH2t1cBtNGjW4SkqYWCbD5kI+LsSeg8v3KpNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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