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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12837686c72a8554ce3e22540d17f0a372f10f44040b760c601c7ebe997b317d' 
  AND token = 'p3CpNGGohJ6fFU0WQNv2DCtMXBz522TYylKSzYy7DNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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