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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5432d87b6f941baa84ef9ef59f961980c495ead0f2bbe603218dfd7db872f3d' 
  AND token = 'dt2Ht9txgNLpLr6deJ9aIHpKgv1+fSkxlJhx0Zkeapc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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