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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c6c64c9ec849a054431a670620ad30740a1bc7623d37a342951da0856b8a33' 
  AND token = 'GCsIcE+8Pt4xYAojaqrQdZ7fCccAsZ178S2iK3Z+36E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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