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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a032fe6ab2e846c5741e5de87b4e16909c36f7f9476d38f06c8568937142bf2d' 
  AND token = '1j3WpN86Tcj3Zf1GTzY0tl1+s5H784udDYCIz7of3Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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