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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba40e8ba2f2b9a03d0aea98b092a38bd7d9446aa42ee0177a4966bb1eb673a36' 
  AND token = 'FQXkWoZRa0dTiwM2Hv1kftdurDpwpPpoIUzRGcKQwwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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