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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9dd23fa7b452d0a973fbfe95216cdd8988f327054f08958ee1108f200267112' 
  AND token = 'MHR9t2QzXoYXVyK8P6VMoW7ArrdrGUv3viQWB9p7T8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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