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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36fadcbf91228395e01f744d184002e0b41a337375e6391ef1e71b61ad74e65e' 
  AND token = '2SjsIrIeXBXCgS7SFASDfFBxnOxH404jQ7Lal2qOSQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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