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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb77b9500e35694f398f562fb7ee10435c2585c6636c3c9eca85ab131f42e61' 
  AND token = 'eYN6EGjDK5Ssf4oJYvumdEC8mqt1I8BZYGCjnEa91UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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