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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d20d719dcf7c97c0a9bfbfa514d39afae440bfc70e25a120783214398b9506' 
  AND token = 'eaTXvHBwzFMX7gvhxSZ056Q4L3VLavBmdfl8OEV6B+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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