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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd884dcbeccce398ff26952cddfa0bb37425511d92eba10ba0807bdae236f8dff' 
  AND token = 'U5N/w9xgr+jvZJL2w2aCPLrW4w8PHY+P7ysvwcMi5ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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