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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73182a38e36edd34ca1f4d1345f803ee6e6b76910fad7d1c9726671d7d12225d' 
  AND token = 'gWYTADk1jVYne7uevTayOxue8clyTfNjc+A2273oMl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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