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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6e088239ca71993fab0529fc48e83c3ec7cbdd1410f4099f68fae6651566ca' 
  AND token = 'L7nRVfivcHnC1vZAdAE9Dhh1huA7Xm1X2gqrepSzkNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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