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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1523ff126d2a60fe1bd812aeafa4b01e5b658cbfabbe222ae56238a05cbee7bd' 
  AND token = 'OfVgRbM9dZ9VxQE3tISaQMDT6dRyznKg+wRSV2AVRPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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