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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0382f13cd5b7feff79898fc6d6835a17a87c58174b3dae0e4bb6212830c4eefa' 
  AND token = 'LktZ8E+H4Pqacawv3vQSqOislGO7GN3IdIqzUBw6l4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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