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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432e027c491cba0632fab303580f83c83dede660bb7099db14532fc4f82a5980' 
  AND token = 'Ysi/RywtQ10DccE+0fKNktH5IQPDv0qEOsGq7bhnA/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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