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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa8b86dca9f5ab6fe52a724b44f84605741f9963403bfd5c490a59cbf1dd3e7' 
  AND token = 'KwQcSjnGdD2o2LLFa5KcZE5aeQjUTi6Yn/0Upe1rfXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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