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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd335786bac0a097a09959e488086096453f24758b51da6e403b9d03214d244f5' 
  AND token = 'gIyf7ovTQCKr4ITKgGtcBPhEaG4X11G+yJYJ9z0+i4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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