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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a19f5ca1e788a115e4136416c86cd53bc3cec647646755c3b81e9fc0606bc6f' 
  AND token = 'L2tEwacnvJriqPLdKf+/F+2ZA3qg6o/i6+b5iJBSrDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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