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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3025676307b0d3344ad64eaf0e849655aeb76c77e095c39c2856d00b529b0a8e' 
  AND token = 'QFSDfW16owE7Hmfd+4Oh+BO3AacCr50PVJACVfe/OnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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