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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830e0ea77538b8dab68ce8ea1ac7d656143f78ae13b2ca52fcdd6497e8c7a66a' 
  AND token = 'BHAj9wlPGPzF9kCaNIWnhpi6zz8mS9HFiIFWFP+lVfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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