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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c52d7ee398e84d5d1e5e564c3b9afdb04929d0449fadb7c5494715291c23f758' 
  AND token = 'W73aowPj8NyUd/xW0Qf1b8AdYUPmm/m9J/ofgoaNtYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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