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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3a6c7ea40bcd09b9337b9dd4e7a0f1486045962bddaa67ead7a9b039e6b901' 
  AND token = 'Fxuk12oPc5aPodQ7oOu1WsDqnvOvqZFJvk0G6J9p8fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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