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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27dbd459438aaadcc786bd5004d8199b87adb1ae723fc27c6f4bc1a4963e827b' 
  AND token = 'vjA35YhIJesxER4+NOswljyk/6QgOqna4mDg43SePdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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