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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28e508e0f9f518c0c0f72daa478867dc6256d80916384f905190dbf576482a4' 
  AND token = 'VjJb03zc5mk7Av41sTnW12hETqZF0/PfGHUA3lXu7P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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