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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030bb6993c21701a60fbd98a8945ee41db17303ee454a2411d6f3239ff7c130d' 
  AND token = 'IZPzxVAjrTIgXyZkKaZn50aNf6fdohUlJwDF51psEZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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