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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdce3ad8a87f0004ef7b23e4df3e3624b1ee63fc5c63e8a79dbca68426b91d60' 
  AND token = 'DGsvWblDu8bStFtZI6cf/24ZSDTNmnyJb4OEmfXeXhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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