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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ce4ee6dad1788430749efda1138e34c5187aa4c979620b0b7e1b63f35276c3' 
  AND token = '+hCqU7JznC9Qn1OAzaEljxR8MeYTdhoNZKSf57vKe0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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