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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f716d4b1755e00f76f47334d2ecf69f8c49d6c8890d8c1d04ccc721df599c38' 
  AND token = 'zA9UoURqPI3HPEq0B4ctz6sghCYaNV7bm/SoM7Gn7XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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