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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db43ff5daaad0fedb426a4e0e0334a66ccdc0c6b66e811ffa5c1ec3c82e9623b' 
  AND token = 'Qbpy7l/70KgzrKicNpKB3fItRqyjt1mwtEcbaCMSGHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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