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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a190dec0116327b2a00f7ccdb207dae5988b9501f131aee933ab9c32b13f80' 
  AND token = 'Vj86Q5DDgHXc9AlNTXM3kCzPi+gkC8SofJO7+Sik3Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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