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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf9a3d65182648018cdcc356cdef4d02fa8dc71dc532b0f586e024a5694e726' 
  AND token = 'XBiBtCAiS15fpVAjvAay5BXhOMIf0cMQowvwmVO8hUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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