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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14cdafe07885b0dbe187838d22414efc750304f83dc777855d0ca9bf0a77ebf3' 
  AND token = 'Hd/52Vi0wY5bKYBbptNhfbEgneLiEUrpgkwWR99+j3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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