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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2911d3bb68df8cea76f9f33602633a787b21ac49e0f50f21546226566ec4d151' 
  AND token = 'Btx15gmRvtAvWHDI9A+ou6/sJ4oCH56tynVW3y2lwE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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