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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615b7294bb8107736838cf25b8799976775b7c264f978425dc5afb6cf14c9a29' 
  AND token = 'AsxVrhOLGUcqC9B9nLT/4ep3lZjHmUI75k4os20OMLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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