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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a64d17e6a09129f0edabcc676ab7bc62d8bb9cfc04a211bf50aa71fc6b4b2428' 
  AND token = 'G5QrQqjMdlCn7vwQPD+H4diZUQGfs98wBLrOvC9A6zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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