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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa250e28309dcfeff46f2837afe067838a86735db3c8674a93620e2c68ce473' 
  AND token = 'ypHiYT+y03rzzr8KbRPSEF3im86w3u118UI4VbuQNpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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