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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a94ee322bf5b30eb715290138c79879c918655802c468ab8e42b43f145781f' 
  AND token = 'JzbUEWvFXP01KeCnNu1cuy3BXNXLKndMVTr/mZkmAWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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