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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dee34265149eb450b5f85ddf861d4fa8614211af1ee17d14d9dd2202c49e9c7' 
  AND token = 'L8FhMg1gBGFLy5akWzITR63QM2PI5OLp28RkY8vPDDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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