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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a362607d0048c9c22634d6fcb4f7d7a4f90e579a177a4a4205a4519848f91582' 
  AND token = 'Br5EBcxQoGjnBXoN0R28EPG0cq8Kv3okJGjd+zbTOWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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