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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c5578b09f77a6deaa6a4c2d8113943265d0d135a05622de8be819e63a7d731' 
  AND token = 'uTye9u9iz8VNqY4jx9716Kfy8Joy9SkuQaO2Vbb+47U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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