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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79953431c48b8f956e515e85be95c273f69290c04f83c45b4a35a1f0172eb44' 
  AND token = 'sGZXZWEkmjGnx7v0oB/kaAtpV01AzVtIfHNC5ocBqek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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