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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fd9290f475e7d236528ab8286cf6925b53a2c837d4f9873dcc3d7c170881cb' 
  AND token = 'Ox20i1PE5wx9ocnUd4Z+VTXxbEWV5zjMNIPPZG9noUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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