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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf9a50641c51106805a39a126716e8e14f5bee45be7f72a985de6122bf23da1f' 
  AND token = 'Lg8UxRjVlYCywK8QAq+6bz61Q1yaEk9BbeqWl++EyfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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