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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4706fd493494de9e95adab8acdb7b73cd44bc311778d7e5ab51e5ba16135dae' 
  AND token = 'wBRcgLGqlx15n4hQpO52Ro+UJu4OfInHihphO9j8htI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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