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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e74deccde1bd7c5a4a5f1fdb263479b265030df47318afd940fe6767a3613f30' 
  AND token = 'KeHa5cvvxtJhtmc6nQWS0U/Rg4JEb5vkcFdfFmcH/30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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