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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3733ea1f1f27cb84479621ae2c5b739e7b678b5c05ad3c8e95dfc54d8a8d8e6' 
  AND token = 'naaiN5ZfgMjH9kpZcN5fa+vPukXF/nfn9ah6AuWWkpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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