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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905d19e7f8ace3331e1df66610daa41321582820ec952667bf0559801213157d' 
  AND token = 'paoaK8qC84kbDUHKwvngpGxZms7GM0kcQQT3zCg/mSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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