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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de065d7b4f247a0f4f1a85cd1bcda6a9f05d1de1595be20eb788b4d15fd82bd' 
  AND token = 'WMm42ZjY1XRlAWHcoXXslFgyVJsAsQ44A2jJCnWmP5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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