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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65abd5c274276ba68b7aaeeed2d64aea0dc84547453a1433484006bc86a41ca1' 
  AND token = 'gBh7yr8ttfX767nVvT5D73IBLHrWdyfodFJv+5n0uXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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