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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108bb4e3b750340f916c537d3cb11c30b7eb5c124d4e19c838b31e54e2966075' 
  AND token = 'atMIMUVSzHDK7i6gBk0RWhioV2uRAubQAg1pLzi1CLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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