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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2670478de4989bd3f3b63b82dc8ec4a5f7e3ada38ace2a2ef5ff91dd6a90ab7b' 
  AND token = 'pDlbfay486IJpTZ9SIveqyzd3JuTO93HxWU8xdQRKDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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