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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d5ec6bbaf20b54cb380bc259dc3afdd47c15e15ac3f2f0c9e8b034d33875a2' 
  AND token = 'zEdQQ9ZUJwyxsTTPwX9cDGCpBw6Lso8lj3ylcpk01Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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