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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac823d0453638f2715ef9dd8b6d77d55ad38a5e44c03e1c41c6133d68e449e9' 
  AND token = '1dngSKeCUdGoc+hwlZTxo9BYOSykx/xFhz1DspBygho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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