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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf4deffaef82ba88f9911ae8deee59784d52cf1f7db25e5de7c09281bf01420' 
  AND token = 'ScAanIWGGh19OsuAFmFATGSUdumy+S/01hAVgrznz2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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