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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476a63d135375682e7e47bdc5988d63893775db663fa29ac73056e8e9d03a2cd' 
  AND token = 'AzD+Hz4JJMGMDOuS/t+10xKs8c1Mm7Q9yBwW4azd/tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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