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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8aca0b26b6a08f932212195aed0caac66f80399fd56663abb699e0d6effb93' 
  AND token = 'QajIyTODh+kg/iYcSZEfETRgGpB/AhP3M6y45Bm6jZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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