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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d91785198dbbd915ffd73b36b1463c2d8786ceb7a5bf656e135f330ab03b37f' 
  AND token = '6fdeoU1a32RYRo90jD3riWatSyXXPQvATnVozryMFbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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