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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0896a05b1e30519a795144618b75362c7d249b3af474e9cf6bc13e534fd1a762' 
  AND token = 'h2YRmX865uBU5NjopcsqqAuKMoBYtZNukkF8KJeTfco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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