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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb9420599d9738c22d053d6a4b4371156b4bdfe621ed762b93e54b2b95e442bb' 
  AND token = 'NsP1ibNPnJSHmFmqrOubZXIW9VXeSnkl1DVspKAh0lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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