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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c98fd14192f8c58fbf62c7a8c14d348913b4aa69e942e1d6aa0c66f42210ccc' 
  AND token = 'lyp+pyBuOHLUoQNl5ewRsxUdaykj/xJJbUXnQIKX3WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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