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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac34bd7cc7e6b2eb86e285c8a578bc06896e97c683573ba8e61d6445170eec5' 
  AND token = 'dMcdQlwW77jBySb0BvtRr3njayhDiG1lyp+W3+ToLdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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